package es.efor.ics.gev.dao;

import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.MissingResourceException;
import java.util.Random;
import java.util.ResourceBundle;

import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.sql.DataSource;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.orm.jpa.JpaTemplate;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.AbstractTransactionalJUnit4SpringContextTests;

/**
 * Base class for running DAO tests.
 * 
 * @author mraible
 */
@ContextConfiguration(locations = {
		"classpath:/applicationContext-resources.xml",
		"classpath:/applicationContext-dao.xml",
		"classpath*:/applicationContext.xml",
		"classpath:**/applicationContext*.xml" })
public abstract class BaseDaoTestCase extends
		AbstractTransactionalJUnit4SpringContextTests {

	@PersistenceContext
	EntityManager entityManager;
	
	@Autowired
    DataSource dataSource;

	/**
	 * Log variable for all child classes. Uses LogFactory.getLog(getClass())
	 * from Commons Logging
	 */
	protected final Log log = LogFactory.getLog(getClass());
	/**
	 * ResourceBundle loaded from
	 * src/test/resources/${package.name}/ClassName.properties (if exists)
	 */
	protected ResourceBundle rb;

	protected static Random rand = new Random();
	
	/**
	 * Default constructor - populates "rb" variable if properties file exists
	 * for the class in src/test/resources.
	 */
	public BaseDaoTestCase() {
		// Since a ResourceBundle is not required for each class, just
		// do a simple check to see if one exists
		String className = this.getClass().getName();

		try {
			rb = ResourceBundle.getBundle(className);
		} catch (MissingResourceException mre) {
			// log.warn("No resource bundle found for: " + className);
		}
	}

	/**
	 * Utility method to populate a javabean-style object with values from a
	 * Properties file
	 * 
	 * @param obj
	 *            the model object to populate
	 * @return Object populated object
	 * @throws Exception
	 *             if BeanUtils fails to copy properly
	 */
	protected Object populate(Object obj) throws Exception {
		// loop through all the beans methods and set its properties from its
		// .properties file
		Map<String, String> map = new HashMap<String, String>();

		for (Enumeration<String> keys = rb.getKeys(); keys.hasMoreElements();) {
			String key = keys.nextElement();
			map.put(key, rb.getString(key));
		}

		BeanUtils.copyProperties(map, obj);

		return obj;
	}

	/**
	 * Create a JpaTemplate from the EntityManager and call flush() on it.
	 * Designed to be used after "save" methods in tests:
	 * http://issues.appfuse.org/browse/APF-178.
	 * 
	 * @throws org.springframework.beans.BeansException
	 *             when can't find 'entityManager' bean
	 */
	protected void flush() throws BeansException {	  
		JpaTemplate jpaTemplate = new JpaTemplate(this.entityManager);
		jpaTemplate.flush();	
//		this.entityManager.flush();
//		this.entityManager.clear();
	}
	
	/**
	 * Genera cadena de texto aleatorio.
	 * 
	 * @return random string
	 */
	protected String randomString() {
		return Long.toString(Math.abs(rand.nextLong()), 36);
	}	
	
}
